<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .c1{
            background-color: purple;
            height: 100px;
            width: 100px;
        }
        .c2{
            background-color: green;
        }

    </style>

</head>
<body>

<div class="c1"></div>


<script src="jquery.js"></script>
<script>


</script>
</body>
</html>